I'd agree with 3.5. I might even be tempted to go with a 3! Could do with seeing a shot from behind to look at how "apple-like" his hindquarters are, and whether his barrel protrudes sideways, but I think they shouldn't be too far that way looking at the rest of him. Doesn't look cresty from the pic where you can see his neck best, barrel isn't too rotund from the side-on pics!
Seems quite a well-built type as well, so in good nick!
Yes, I did think a shot from behind would have been useful, but I thought about it once I got home - doh!
He is flat when viewed from behind - no hint of a gutter, but here a picture would have told a thousand words! Ribs can be felt, but I need to apply slight pressure.